Auto merge of #65422 - tmandry:rollup-r5u3mlc, r=tmandry

Rollup of 10 pull requests

Successful merges:

 - #65170 (rustc_metadata: Privatize private code and remove dead code)
 - #65260 (Optimize `LexicalResolve::expansion`.)
 - #65261 (Remove `Option` from `TokenStream`)
 - #65332 (std::fmt: reorder docs)
 - #65340 (Several changes to the codegen backend organization)
 - #65365 (Include const generic arguments in metadata)
 - #65398 (Bring attention to suggestions when the only difference is capitalization)
 - #65410 (syntax: add parser recovery for intersection- / and-patterns `p1 @ p2`)
 - #65415 (Remove an outdated test output file)
 - #65416 (Minor sync changes)

Failed merges:

r? @ghost

Author: bors

src/liballoc/fmt.rs

@@ -304,7 +304,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
     }
 
     fn expansion(&self, var_values: &mut LexicalRegionResolutions<'tcx>) {
-        self.iterate_until_fixed_point("Expansion", |constraint| {
+        self.iterate_until_fixed_point(|constraint| {
             debug!("expansion: constraint={:?}", constraint);
             let (a_region, b_vid, b_data, retain) = match *constraint {
                 Constraint::RegSubVar(a_region, b_vid) => {
@@ -360,13 +360,21 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
         match *b_data {
             VarValue::Value(cur_region) => {
                 // Identical scopes can show up quite often, if the fixed point
-                // iteration converges slowly, skip them
+                // iteration converges slowly. Skip them. This is purely an
+                // optimization.
                 if let (ReScope(a_scope), ReScope(cur_scope)) = (a_region, cur_region) {
                     if a_scope == cur_scope {
                         return false;
                     }
                 }
 
+                // This is a specialized version of the `lub_concrete_regions`
+                // check below for a common case, here purely as an
+                // optimization.
+                if let ReEmpty = a_region {
+                    return false;
+                }
+
                 let mut lub = self.lub_concrete_regions(a_region, cur_region);
                 if lub == cur_region {
                     return false;
@@ -407,8 +415,6 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
 
     /// Returns the smallest region `c` such that `a <= c` and `b <= c`.
     fn lub_concrete_regions(&self, a: Region<'tcx>, b: Region<'tcx>) -> Region<'tcx> {
-        let tcx = self.tcx();
-
         match (a, b) {
             (&ty::ReClosureBound(..), _)
             | (_, &ty::ReClosureBound(..))
@@ -468,15 +474,15 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
 
                 // otherwise, we don't know what the free region is,
                 // so we must conservatively say the LUB is static:
-                tcx.lifetimes.re_static
+                self.tcx().lifetimes.re_static
             }
 
             (&ReScope(a_id), &ReScope(b_id)) => {
                 // The region corresponding to an outer block is a
                 // subtype of the region corresponding to an inner
                 // block.
                 let lub = self.region_rels.region_scope_tree.nearest_common_ancestor(a_id, b_id);
-                tcx.mk_region(ReScope(lub))
+                self.tcx().mk_region(ReScope(lub))
             }
 
             (&ReEarlyBound(_), &ReEarlyBound(_))
@@ -490,7 +496,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
                 if a == b {
                     a
                 } else {
-                    tcx.lifetimes.re_static
+                    self.tcx().lifetimes.re_static
                 }
             }
         }
@@ -860,7 +866,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
         }
     }
 
-    fn iterate_until_fixed_point<F>(&self, tag: &str, mut body: F)
+    fn iterate_until_fixed_point<F>(&self, mut body: F)
     where
         F: FnMut(&Constraint<'tcx>) -> (bool, bool),
     {
@@ -870,7 +876,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
         while changed {
             changed = false;
             iteration += 1;
-            debug!("---- {} Iteration {}{}", "#", tag, iteration);
+            debug!("---- Expansion iteration {}", iteration);
             constraints.retain(|constraint| {
                 let (edge_changed, retain) = body(constraint);
                 if edge_changed {
@@ -880,7 +886,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
                 retain
             });
         }
-        debug!("---- {} Complete after {} iteration(s)", tag, iteration);
+        debug!("---- Expansion complete after {} iteration(s)", iteration);
     }
 
     fn bound_is_met(

src/librustc/infer/lexical_region_resolve/mod.rs

@@ -32,6 +32,12 @@ pub struct CrateSource {
     pub rmeta: Option<(PathBuf, PathKind)>,
 }
 
+impl CrateSource {
+    pub fn paths(&self) -> impl Iterator<Item = &PathBuf> {
+        self.dylib.iter().chain(self.rlib.iter()).chain(self.rmeta.iter()).map(|p| &p.0)
+    }
+}
+
 #[derive(RustcEncodable, RustcDecodable, Copy, Clone,
          Ord, PartialOrd, Eq, PartialEq, Debug, HashStable)]
 pub enum DepKind {
@@ -208,7 +214,6 @@ pub trait CrateStore {
     fn crate_is_private_dep_untracked(&self, cnum: CrateNum) -> bool;
     fn crate_disambiguator_untracked(&self, cnum: CrateNum) -> CrateDisambiguator;
     fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh;
-    fn extern_mod_stmt_cnum_untracked(&self, emod_id: ast::NodeId) -> Option<CrateNum>;
     fn item_generics_cloned_untracked(&self, def: DefId, sess: &Session) -> ty::Generics;
     fn postorder_cnums_untracked(&self) -> Vec<CrateNum>;
 

src/librustc/middle/cstore.rs

@@ -23,7 +23,7 @@ use syntax::feature_gate::UnstableFeatures;
 use syntax::source_map::SourceMap;
 
 use errors::emitter::HumanReadableErrorType;
-use errors::{ColorConfig, FatalError, Handler};
+use errors::{ColorConfig, FatalError, Handler, SourceMapperDyn};
 
 use getopts;
 
@@ -1857,6 +1857,7 @@ struct NullEmitter;
 
 impl errors::emitter::Emitter for NullEmitter {
     fn emit_diagnostic(&mut self, _: &errors::Diagnostic) {}
+    fn source_map(&self) -> Option<&Lrc<SourceMapperDyn>> { None }
 }
 
 // Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.

src/librustc/session/config.rs

@@ -43,7 +43,7 @@ use crate::ty::subst::{UserSubsts, GenericArgKind};
 use crate::ty::{BoundVar, BindingMode};
 use crate::ty::CanonicalPolyFnSig;
 use crate::util::common::ErrorReported;
-use crate::util::nodemap::{DefIdMap, DefIdSet, ItemLocalMap, ItemLocalSet};
+use crate::util::nodemap::{DefIdMap, DefIdSet, ItemLocalMap, ItemLocalSet, NodeMap};
 use crate::util::nodemap::{FxHashMap, FxHashSet};
 use crate::util::profiling::SelfProfilerRef;
 
@@ -1051,6 +1051,9 @@ pub struct GlobalCtxt<'tcx> {
     /// Common consts, pre-interned for your convenience.
     pub consts: CommonConsts<'tcx>,
 
+    /// Resolutions of `extern crate` items produced by resolver.
+    extern_crate_map: NodeMap<CrateNum>,
+
     /// Map indicating what traits are in scope for places where this
     /// is relevant; generated by resolve.
     trait_map: FxHashMap<DefIndex,
@@ -1274,6 +1277,7 @@ impl<'tcx> TyCtxt<'tcx> {
             types: common_types,
             lifetimes: common_lifetimes,
             consts: common_consts,
+            extern_crate_map: resolutions.extern_crate_map,
             trait_map,
             export_map: resolutions.export_map.into_iter().map(|(k, v)| {
                 let exports: Vec<_> = v.into_iter().map(|e| {
@@ -2951,7 +2955,7 @@ pub fn provide(providers: &mut ty::query::Providers<'_>) {
     };
     providers.extern_mod_stmt_cnum = |tcx, id| {
         let id = tcx.hir().as_local_node_id(id).unwrap();
-        tcx.cstore.extern_mod_stmt_cnum_untracked(id)
+        tcx.extern_crate_map.get(&id).cloned()
     };
     providers.all_crate_nums = |tcx, cnum| {
         assert_eq!(cnum, LOCAL_CRATE);

src/librustc/ty/context.rs

@@ -28,7 +28,7 @@ use crate::ty::subst::{Subst, InternalSubsts, SubstsRef};
 use crate::ty::util::{IntTypeExt, Discr};
 use crate::ty::walk::TypeWalker;
 use crate::util::captures::Captures;
-use crate::util::nodemap::{NodeSet, DefIdMap, FxHashMap};
+use crate::util::nodemap::{NodeMap, NodeSet, DefIdMap, FxHashMap};
 use arena::SyncDroplessArena;
 use crate::session::DataTypeKind;
 
@@ -121,6 +121,7 @@ mod sty;
 
 #[derive(Clone)]
 pub struct Resolutions {
+    pub extern_crate_map: NodeMap<CrateNum>,
     pub trait_map: TraitMap,
     pub maybe_unused_trait_imports: NodeSet,
     pub maybe_unused_extern_crates: Vec<(NodeId, Span)>,

src/librustc/ty/mod.rs

@@ -52,6 +52,7 @@ const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
 
 impl BackendTypes for Builder<'_, 'll, 'tcx> {
     type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
+    type Function = <CodegenCx<'ll, 'tcx> as BackendTypes>::Function;
     type BasicBlock = <CodegenCx<'ll, 'tcx> as BackendTypes>::BasicBlock;
     type Type = <CodegenCx<'ll, 'tcx> as BackendTypes>::Type;
     type Funclet = <CodegenCx<'ll, 'tcx> as BackendTypes>::Funclet;

src/librustc_codegen_llvm/builder.rs

@@ -33,7 +33,7 @@ pub fn get_fn(
     assert!(!instance.substs.has_param_types());
 
     let sig = instance.fn_sig(cx.tcx());
-    if let Some(&llfn) = cx.instances().borrow().get(&instance) {
+    if let Some(&llfn) = cx.instances.borrow().get(&instance) {
         return llfn;
     }
 

src/librustc_codegen_llvm/callee.rs

@@ -2,7 +2,7 @@
 
 //! Code that is useful in various codegen modules.
 
-use crate::llvm::{self, True, False, Bool, BasicBlock, OperandBundleDef};
+use crate::llvm::{self, True, False, Bool, BasicBlock, OperandBundleDef, ConstantInt};
 use crate::abi;
 use crate::consts;
 use crate::type_::Type;
@@ -86,6 +86,8 @@ impl Funclet<'ll> {
 
 impl BackendTypes for CodegenCx<'ll, 'tcx> {
     type Value = &'ll Value;
+    type Function = &'ll Value;
+
     type BasicBlock = &'ll BasicBlock;
     type Type = &'ll Type;
     type Funclet = Funclet<'ll>;
@@ -243,33 +245,23 @@ impl ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         struct_in_context(self.llcx, elts, packed)
     }
 
-    fn const_to_uint(&self, v: &'ll Value) -> u64 {
-        unsafe {
+    fn const_to_opt_uint(&self, v: &'ll Value) -> Option<u64> {
+        try_as_const_integral(v).map(|v| unsafe {
             llvm::LLVMConstIntGetZExtValue(v)
-        }
-    }
-
-    fn is_const_integral(&self, v: &'ll Value) -> bool {
-        unsafe {
-            llvm::LLVMIsAConstantInt(v).is_some()
-        }
+        })
     }
 
     fn const_to_opt_u128(&self, v: &'ll Value, sign_ext: bool) -> Option<u128> {
-        unsafe {
-            if self.is_const_integral(v) {
-                let (mut lo, mut hi) = (0u64, 0u64);
-                let success = llvm::LLVMRustConstInt128Get(v, sign_ext,
-                                                           &mut hi, &mut lo);
-                if success {
-                    Some(hi_lo_to_u128(lo, hi))
-                } else {
-                    None
-                }
+        try_as_const_integral(v).and_then(|v| unsafe {
+            let (mut lo, mut hi) = (0u64, 0u64);
+            let success = llvm::LLVMRustConstInt128Get(v, sign_ext,
+                                                        &mut hi, &mut lo);
+            if success {
+                Some(hi_lo_to_u128(lo, hi))
             } else {
                 None
             }
-        }
+        })
     }
 
     fn scalar_to_backend(
@@ -305,7 +297,7 @@ impl ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
                         }
                     }
                     Some(GlobalAlloc::Function(fn_instance)) => {
-                        self.get_fn(fn_instance)
+                        self.get_fn_addr(fn_instance)
                     }
                     Some(GlobalAlloc::Static(def_id)) => {
                         assert!(self.tcx.is_static(def_id));
@@ -386,3 +378,9 @@ pub fn struct_in_context(
 fn hi_lo_to_u128(lo: u64, hi: u64) -> u128 {
     ((hi as u128) << 64) | (lo as u128)
 }
+
+fn try_as_const_integral(v: &'ll Value) -> Option<&'ll ConstantInt> {
+    unsafe {
+        llvm::LLVMIsAConstantInt(v)
+    }
+}

src/librustc_codegen_llvm/common.rs

@@ -20,7 +20,6 @@ use rustc::ty::layout::{
 use rustc::ty::{self, Ty, TyCtxt, Instance};
 use rustc::util::nodemap::FxHashMap;
 use rustc_target::spec::{HasTargetSpec, Target};
-use rustc_codegen_ssa::callee::resolve_and_get_fn;
 use rustc_codegen_ssa::base::wants_msvc_seh;
 use crate::callee::get_fn;
 
@@ -327,11 +326,11 @@ impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         &self.vtables
     }
 
-    fn instances(&self) -> &RefCell<FxHashMap<Instance<'tcx>, &'ll Value>> {
-        &self.instances
+    fn get_fn(&self, instance: Instance<'tcx>) -> &'ll Value {
+        get_fn(self, instance)
     }
 
-    fn get_fn(&self, instance: Instance<'tcx>) -> &'ll Value {
+    fn get_fn_addr(&self, instance: Instance<'tcx>) -> &'ll Value {
         get_fn(self, instance)
     }
 
@@ -362,7 +361,14 @@ impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         let tcx = self.tcx;
         let llfn = match tcx.lang_items().eh_personality() {
             Some(def_id) if !wants_msvc_seh(self.sess()) => {
-                resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]))
+                self.get_fn_addr(
+                    ty::Instance::resolve(
+                        tcx,
+                        ty::ParamEnv::reveal_all(),
+                        def_id,
+                        tcx.intern_substs(&[]),
+                    ).unwrap()
+                )
             }
             _ => {
                 let name = if wants_msvc_seh(self.sess()) {
@@ -390,7 +396,14 @@ impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         let tcx = self.tcx;
         assert!(self.sess().target.target.options.custom_unwind_resume);
         if let Some(def_id) = tcx.lang_items().eh_unwind_resume() {
-            let llfn = resolve_and_get_fn(self, def_id, tcx.intern_substs(&[]));
+            let llfn = self.get_fn_addr(
+                ty::Instance::resolve(
+                    tcx,
+                    ty::ParamEnv::reveal_all(),
+                    def_id,
+                    tcx.intern_substs(&[]),
+                ).unwrap()
+            );
             unwresume.set(Some(llfn));
             return llfn;
         }

src/librustc_codegen_llvm/context.rs

@@ -20,9 +20,9 @@ use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
 use rustc::hir;
 use syntax::ast::{self, FloatTy};
 
+use rustc_codegen_ssa::common::span_invalid_monomorphization_error;
 use rustc_codegen_ssa::traits::*;
 
-use rustc::session::Session;
 use syntax_pos::Span;
 
 use std::cmp::Ordering;
@@ -1026,10 +1026,6 @@ fn get_rust_try_fn<'ll, 'tcx>(
     rust_try
 }
 
-fn span_invalid_monomorphization_error(a: &Session, b: Span, c: &str) {
-    span_err!(a, b, E0511, "{}", c);
-}
-
 fn generic_simd_intrinsic(
     bx: &mut Builder<'a, 'll, 'tcx>,
     name: &str,